----- Original Message -----
From: Mike Crawford
To: harryproa@yahoogroups.com.au
Subject: [harryproa] Re: Crazy rudder idea
Date: Tue, 15 Jun 2010 09:52:51 -0400

 

  I believe that Rudolph is looking to keep his foils as short as possible because of where Blind Date sails.  The IJsselmeer has an average depth of 5m to 6m, but many parts aremuch more shallow than that.  Thus, the desire for shallow foils that kick up.

  Given that the foils are doing double duty as steering and leeway prevention, it's possible that the boats need slightly deeper foils than formulae would otherwise indicate, and your extra 30 cm is just the ticket.

  However, 30cm extra depth on sidecar might mean 60cm on Blind date, which might be too deep for the design criteria.  It also means the rudders (and/or stocks, if it's the new design) need to be that much stronger.

  As a result of your and Rudolph's experience and expertise, I'll probably go with longer foils that match what you added to sidecar, that are as far fore and aft as I can reasonably get them.

        - Mike
 

On 6/14/2010 6:22 AM, Doug Haines wrote:

 

I have great steering control now on sidecar, since i added 30cm of depth to the rudder blade, How is it the other boats are different?   DOug Albany --- On Mon, 14/6/10, Arto Hakkarainen <ahakkara@yahoo.com> wrote: From: Arto Hakkarainen <ahakkara@yahoo.com> Subject: Re: [harryproa] Re: Crazy rudder idea To: harryproa@yahoogroups.com.au Date: Monday, 14 June, 2010, 19:49   Speaking of foils I talked on the phone yesterday with Arttu. He has installed the two daggerboards he planned to Ono. One daggerboard for each tack. He seemed quite happy with them after the first test sails and said they seemed to improve performance significantly. Boat also feeled better to sail.   Arto

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